So, I sprayed Scotchgard on my Prius C seats, but some overspray made permanent marks on some plastic. First, it got the plastic around the gearshift, and also the rear passenger door. Well, turns out a new rear passenger door interior panel will cost $450. Too much for me now. But at my 5,000 mile service, I am going to get the gearshift plastic replaces. I assume around $100. Listen carefully: if you use Scotchgard, do NOT get it on any of the plastic! Something in it destroys plastic!
I contacted Scotchgard, and all I got was, "Please follow your car manufacturer's suggestions for cleaning it off." lol I found that Armor All covers it up pretty well, but you know, I still know it is there. So, I will have to, one-by-one, replace what I ruined.
Wish I found this earlier. Just ruined my door panel on a three week old car I was trying to protect from staining as the rains started this month. Stay away from the rubbing alcohol removal that you come across when googling how to remove it just makes things worse by removing the dye from the panel. Never Again. Meguires ultimate protectant hides it but at certain angles you can tell.
Are you talking about the one-piece plastic panel that goes all the way from the window sill to the bottom? If so, that thing is made of a special plastic that is naturally stain and dirt repellent, so I don't think you need any sort of protectant. On my 2013 with 110k it looks brand new, and all I do is occasionally wipe it down while I'm doing the windows (I use Invisible Glass), although it never really gets dirty, except sometimes I see that neon-yellow insect poop stuff I would completely agree with NOT using rubbing alcohol on any plastic parts though. Alcohol dissolves many if not most plastics. Did you try using Goof Off or a citrus-based cleaner?